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Author Archives: Brad
PCI, Magento, and Storing Credit Card Information
The question of whether you can store credit card information within Magento comes up a lot here at Nexcess. The answer to this question is unfortunately not very clear when looking for an answer elsewhere including on the Magento website. … Continue reading
Posted in Magento, Security
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Choosing a Load Balancing Solution
When a website reaches the point where a single web server can no longer handle the amount of traffic to the content or services it provides you must find a way to reliably distribute its load over two or more … Continue reading
Posted in Nexcess
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Testing Network Performance and Throughput with Iperf
Scenario 1: You you have two servers located a large geographical distance apart, say one in The US, the other in the UK. You are copying a large file between these two locations via scp but you are only averaging … Continue reading
Monitoring Linux Bandwidth Utilization with IPTraf and Iftop
I often find myself needing a simple tool to diagnose TCP and UDP connection issues in real time. While tcpdump is an excellent tool for debugging issues at the packet level, a higher level tool is often better to diagnose … Continue reading
Configuring MySQL Replication
The native replication built into MySQL is a powerful tool to keep an identical copy or copies of a database across multiple servers. MySQL replication is useful if you want have an exact copy of a live database for backup … Continue reading
Posted in MySQL
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Using IPMI Tools to Monitor System Hardware
IPMI is the Intelligent Platform Management Interface which is an open standard that is integrated into most systems by hardware manufacturers. IPMI can provide real time hardware information including system temperatures, voltages, fan speeds and hardware status, along with identification … Continue reading
Optimizing APC Cache Settings for Magento
APC (Alternative PHP Cache) is an opcode cache for PHP that works very well to speed up page loads when used on servers running Magento. There are many opcode caches available (APC, accelerator, xcache, etc) which can be used with … Continue reading
Posted in Magento, php
Tagged APC, cache, eAccelerator, magento, memory, opcode, optimizing, PHP, xcache
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Configuring and Using Dell DRAC Cards in Linux
The Dell DRAC (Dell Remote Access Card) is a powerful piece of hardware for remote server management. Utilizing a DRAC card, you can have total server control from remote locations including control to power on or off the server as … Continue reading
Configuring Memcached in Magento 1.4
In the Magento 1.4 release, the memcached backend configuration has changed. There are now more options listed than in previous Magento versions. Some confusion has resulted in how to configure memcached in this new version as the previous configuration for … Continue reading
Changing Your Linux I/O Scheduler
When performance tuning any modern Linux system, selecting a proper I/O scheduler is an important but often under looked optimization. Linux comes configured with the cfq (Completely Fair Queuing) scheduler which has been optimized for best performance over a wide … Continue reading
Posted in Linux
Tagged anticipatory, cfq, command line, deadline, i/o schedule, Linux, noop
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